Structural stay



FIG. 1 is a three-quarter perspective view of an ornamental design for a structural stay.

FIG. 2 is a side view of an ornamental design for a structural stay.

FIG. 3 is a top view of an ornamental design for a structural stay.

FIG. 4 is an underside view of an ornamental design for a structural stay.

FIG. 5 is a rear end-on view of an ornamental design for a structural stay; and,

FIG. 6 is a front end-on view of an ornamental design for a structural stay.

The broken lines in the drawings depict unclaimed environmental subject matter. 

CLAIM The ornamental design for a structural stay, as shown and described. 